A message on Facebook this morning from his daughter, Philomène Grandin, announced that Izzy died on February 4, 2019. He had lived in Sweden for many years.

From Wikipedia:

In 1957, at 110 MacDougal Street in New York City's Greenwich Village, he opened the Folklore Center, a store for books and records and everything related to folk music. It became a focal point for the American folk music scene of the time, a place where one could find such limited circulation publications as Caravan and Gardyloo, both edited and published by Lee Hoffman. From 1959 to 1969, Young wrote a column entitled "Fret and Frails" for the folk music journal Sing Out.[2] He served on the "editorial advisory board" for the magazine until his departure for Sweden a few years later.

Young arranged concerts with folk musicians and songwriters, who often made contacts with other musicians at the Folklore Center. Bob Dylan relates in his memoirs, Chronicles, how he spent time at the Center, where Young allowed him to sit in the backroom of the store, listening to folk music records and reading books. Dylan met Dave Van Ronk in the store, and Young produced Dylan's first concert at Carnegie Chapter Hall in New York City on Saturday, November 4, 1961.[3][4]

Bob Dylan wrote a song about the store and Young entitled "Talking Folklore Center".

https://en.wikipedia.org/wiki/Izzy_Young